网络传输扩展-connect方法未生效

使用自定义的扩展，connect方法仍然执行的是NettyTransporter中的connect。
dubbo版本：3.2.10
在META-INF/dubbo/org.apache.dubbo.remoting.Transporter配置了自定义扩展信息
在配置文件中配置了dubbo.protocol.transporter的值为custom
代码如下：
```
public class CustomTransporter implements Transporter {

public static final String NAME = "custom";

@Override
public RemotingServer bind(URL url, ChannelHandler handler) throws RemotingException {
System.out.println("CustomTransporter:server "+url);
RemotingServer server = new NettyServer(url, handler);
return server;
}

@Override
public Client connect(URL url, ChannelHandler handler) throws RemotingException {
System.out.println("CustomTransporter:client "+url);
Client client = new NettyClient(url, handler);
return client;
}
}
```

Start by reproducing the report with Dubbo 3.2.10, the META-INF/dubbo/org.apache.dubbo.remoting.Transporter registration, and dubbo.protocol.transporter=custom. Trace Transporter.connect resolution against the shown CustomTransporter and NettyTransporter implementations; the issue is done when the configured custom connect method is invoked.

Written by the indexing model from the issue text.